Working on a friend's '49 Nash Ambassador today that's got sticky valve problems. We noticed another problem though: several of the rocker arm spacers on the rocker shaft appear to be missing, so the rocker arms move sideways. Is this normal, or did the last guy in not replace some key parts? Can't find a picture of the rockers in the shop manual. If any one has a picture or knows what is normal on this car your help would be much appreciated. Thanks.